people who are responsible for this. >> monday evening president of barack obamas urged americans not to jump to conclusions but promised justice. >> machel and i send our deepest thoughts and prayers to the families of the victims in wake of this senseless loss. >> a white house official tells cnn president obama received updates all night about what has happened in boston. we are expecting our next update on the fbi. a briefing is scheduled at 930 this morning. >> reporting in boston. >> we are hearii am emily schmi >> we are hearing more reaction from those at the scene of the bombings in boston. here's a phone interview with an eye witness describes the scene. she was near the finish line when the bomb went off. >> i have never heard a noise as loud as that in my entire life. i felt the ground shake like nothing ever before. it was checking for two hours after it happened. i was so shaking up literally. about 25 seconds later i realized i should turn and see what happened. i looked up and saw smoke and everyone screaming and running in different directions. it was utter chaos.